Boiler



.VANES.

BOILER.

' (No Model.)

Patented Oct. 16, 1894. QM...

Inventor:

Witnesses:

Attorneys m: Nonms PETERS co. FNOTOLITHCL. WASHINGTON: nv c.

UNITED STATES PATENT OFFICE.

JOHN VANES, OF BRAZIL, INDIANA.

BOILER.

SPECIFICATION forming part of Letters PatentNo. 527,631, dated October 16, 1894.

Application filed June 25, 1894. Serial No. 515,683. (No model.)

ing to be a full, clear, and exact description t of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

, My present invention relates to steam boilers of that class known to the art as watertube boilers in which the water is exposed or subjected to the heat by circulation through a series of tubes; and the objects that I have in view are, first, to simplify and strengthen the construction of parts; secondly, to increase the heating surface and promote the combustion, and thirdly, to so organize and arrange the parts that ready access can be had to the water tubes and the combustion chamber for the purpose of cleaning the tubes of the scale that is deposited on the interior thereof and of removing the soot and ashes that accumulate in the combustion chamber below the water tubes.

In my improved boiler a furnace chamber is provided by fastening a shell within the external boiler-shell, at the lower front part of the latter, and a combustion chamber is formed in the external boiler-shell by the employment of two flue sheets and an internal shell which are suitably united together to form a closure or chamber through which the heat and products of combustion are free to pass from the furnace chamber to the exit pipe or flue, the flue sheet near the front end of the boiler being formed with a flanged neck or nozzle to which is united the rear end of the shell which forms the furnace chamber, while the other flue sheet near the rear end of the boiler is likewise formed with a flanged neck or nozzle, near its upper part, to receive the inner end of the exit pipe or flue for the smoke and'products of combustion. These two flue sheets are set or arranged in an upright inclined position, substantially parallel to each other, and in these flue sheets are formed the flue holes or openings to receive the water tubes which are fastened in the flue sheets in the ordinary or any preferred way. By thus disposing the flue sheetsI am able to employ straight tubes between the sheets, and the ends of said tubes open through the flue sheets above the furnace shell and below the smoke exit pipe, respectively, whereby ready access can be had (by means of man-holes in the boilerheads) to the water tubes for the purpose of running a scraper, or other implement, through the water tubes and removing the scale from the interior thereof, as well as for easily inspecting the interior of they tubes to ascertain the place and extent of scale deposit, This inspection and cleaning ofthe interior of the tubes is important, particularly when hard water is used in the boiler,

and the employment of straight tubes is advantageous as the attendant can readilylook through the tubes and easily cleanse them.

To promote combustion, I couple the internal shell with the outside boiler shell by means of hollow stay bolts which are placed in rear of the furnace-shell, below the ,series of straight inclined water tubes, for the purpose of admitting air to the combustion chamber so as to commingle with the flame and products of co mbus'tion after they emerge from the furnace chamber and diffuse around the inclined water tubes. A man hole, and .cover therefor, is provided in the bottom of the boiler, in rear of the furnace chamber, to enable access to be had to the combustion chamber for the purpose of removing soot and ashes therefrom.

To enable others to understand my invention, I have illustrated the preferred embodiment thereof in the accompanying drawings, forming a part of this specification, and in which- Figure l isa vertical'longitudinal sectional view through my boiler. Figs.2 and 3 are detail views of the flue sheets. Fig. 4: is a longitudinal sectional view through a boiler embodying my invention in which the bottom manhole and hollow stay bolts are dispensed with. Fig. 5 is a detail view of one of the flue sheets adapted for use in connection with a series of furnace chambers. I

Like lettersvof reference indicate corresponding parts in all the figures, referring to Which- A designates the external boiler shell, and

a, 0,, the front and rear heads thereof, these parts being constructed in any form and manner approved by those skilled in the art. The front boiler head, a, is provided near its lower edge, with a flanged opening b for the introduction of fuel into the furnace chamber, and which opening I) is designed to be closed by a door or doors (not shown), while the rear head a is provided, near its upper edge, with a flanged opening I) for the exit of the smoke and products of combustion into a suitable escape pipe or flue. (Not shown.) Within this external boiler shell, A, I construct a combustion chamber 0 by employing two flue sheets D, E, and an internal shell F which are riveted or otherwise suitably united together. The front flue sheet D is provided, near its lower side and on a line with the opening I), with a flanged neck or nozzle, 01, and said flue sheet D and the front boiler head a are coupled or connected together by the shell G which forms the furnace chamber G within the lower front part of the boiler, one end of this furnace shell G being united to the flange of the opening b and the other end of the shell G being riveted or otherwise fastened to the neck or nozzle 61 of the front flue sheet D, as shown in Figs. 1 and 4. The rear flue sheet E is provided, near its upper side, with a flange forming the neck or nozzle, e, that is in line with the flanged exit opening I), and between this rear flue sheet E and the rear boiler head a is an exit pipe H which has its ends riveted or otherwise united to the neck or nozzle e and the flange around the opening b, respectively.

The grate, I, is supported in the furnace chamber shell G in any suitable way and it is elevated above the bottom of said shell to form the ash pit, g, access to which may be had by a suitable door.

The flue sheets D, E, are set in an upright slanting or inclined position and they are arranged parallel to each other, and in each flue sheet is drilled or formed a plurality of openings to receive the ends of the water tubes J, a large number of which may be employed and which have their ends expanded in the openings of the flue sheets or otherwise suitably secured to said flue sheets. These tubes J extend through the shell forming the combustion chamber in a manner to permit the heat and other products of combustion to circulate freely around them, and the ends of the tubes open into the water chambers J, J", the front part or chamber J being formed between the boiler-head a and the flue sheet D and the rear part or chamber J being formed by and between the rear boiler head a and fine sheet E.

It Will be noted that the tubes J which I employ are straight tubes, without any bend therein, and that they are set in an inclined position to insure free circulation of the wa ter therein. By the employment of the flue sheets set in an inclined or slanting position within the boiler shell, I am able to use these straight water tubes and to set them in an inclined position at right angles to the flue sheets, which organization of parts is advantageous as it enables a scraper to be easily run through and operated in the tubes to remove the scale and sediment that become deposited on the interior surfaces of the tubes, and also enables the attendant to readily look through the tubes to ascertain the extent and place of scale deposit. The front ends of the water tubes open through the flue sheet D above the furnace shell G, and access can be had to these ends of the tubes through a man hole provided in the head a of the boiler shell, said man hole being closed by the head k of any suitable construction. The rear ends of the water tubes open through the flue sheet E below the exit pipe II, and access to these ends of the flue tubes is bad by a man hole I in the boiler head a, which man hole is closed by a head Z A similar man hole m is provided in the bottom of the boiler, in rear of the furnace shell G, and opening into the combustion chamber C below the Water tubes J, for the purpose of cleaning the combustion chamber of the soot, ashes and other refuse that may be carried from the furnace and deposited in the combustion chamber; and this man hole m is closed by the head m which is fastened in place by the usual yoke or bolt or any equivalent fastening.

To insure the proper supply of air and promote combustion in the chamber G, I connect the internal shell F and the boiler shell Aby the hollow stay bolts L which are placed at the bottom side of the boiler and whichform the passages by which air may pass from the outside of the boiler into the combustion chamber in rear of the furnace chamber and independently of the latter,but I would have it understood that I do not strictly confine myself to the use of the man hole m and the hollow stay bolts L as they may be dispensed with and the boiler constructed as shown by Fig. 4:.

If desired, a series of the furnace shells may be used in lieu of the single furnace shown by Figs. 1 and 3, according to the size and capacity of the boiler, and if a series of furnace shells, are used, the head a and flue sheet D are constructed with a corresponding number of flanged openings as indicated by Fig. 5.

It will be noted by reference to Figs. 1 and 4: that my boiler is not constructed with a bridge wall between the grate chamber and the Water tube chamber, but that in my improved construction, the flame, smoke and products of combustion pass horizontally through the open rear end of the furnace shell directly into the combustion chamber C and thence circulate upward and rearward, around the inclined tubes J, to the exit pipe H, and it will be furthermore observed that these water tubes J are inclined from a line above the furnace chamber to a line substantially on a level with the furnace chamber so that the Water tubes are thus interposed or arranged directly in the path of the products ofcombustion as they pass through the boiler.

I am aware that changes in the form and proportion of parts and in the details of construction of the mechanism herein shown and described as an embodiment of my invention can be made without departing from the spirit or sacrificing the advantages of my invention and I therefore reserve the right to make such modifications and alterations as fairly fall within the scope of my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination with an external boiler shell, of the internal shell and flue sheets connected together and forming a combination chamber within the boiler shell, a furnace chamber situated between the front flue sheet and boiler head and having the respective ends of its shell G united to said front flue sheet and the boiler-head,'a smoke exit pipe connected to the other flue sheet and boilerhead,and the straight water tubes extending through the combustion chamber and united to the flue sheets,substantially as and for the purposes described.

2. The combination with an external boiler shell, of the flue sheets and internal shell connected together and forming the combustion chamber within said boiler shell, said flue sheets being set in inclined or slanting positions and substantially parallel to each other, the furnace shell fastened to one flue sheet and boiler-head and opening directly through the flue sheet into the combustion chamber, the exit pipe coupled to the other flue sheet and boiler head above the plane of the opening between the furnace shell and the front flue sheet, and the inclined straight water tubes fastened to said flue sheets, substantially as and for the purposes described.

3. The combination with an external boiler shell, of the inclined flue sheets therein, the internal shell united to the flue sheets, the furnaceshell united to one flue sheet and boiler head and communicating, at its rear end, directly with the combustion chamber, the exit pipe connected to the other flue sheet and boiler head on a line above the furnace shell, and the watertubes united to the two flue sheets and inclined downwardly from the front flue sheet to the rear flue sheet and arranged directly into the path of products of combustion as they emerge from the furnace chamber, substantially as and for the purposes described.

4. The combination with an external boiler shell'having man holes at or near the ends thereof, of the inclined flue sheets, the internal shell united to said flue sheets, the furnace shell united to the lower part of one flue sheet and boiler head and communicating directly with the combustionchamber, the exit pipe coupled to the other flue sheet and boiler shell on a line above the furnace shell, and the straight inclined Water tubes fastened to the front flue sheet above the furnace shell and having their rear ends united to the rear flue sheet substantially in line with the furnace shell and below the exit pipe, substantially as and for the purposes described.

5. The combination with an external boiler shell, of the flue sheets and internal shell connected together and forming the combustion chamber, the furnace shell united to one flue sheet and boiler head and opening directly into the combustion chamber, the exit pipe coupled to the other flue sheet and boiler head on a line above the furnace shell, the hollow stay bolts between the external and internal shells, at the lower part of the boiler, and forming air inlet passages to the combustion chamber in rear of the furnace chamber, and the water tubes united to the front flue sheet above the furnace shell and coupled to the rear flue sheet below the exit pipe, substantially as and for the purposes described.

In testimony whereof Iaffix my signature in presence of two witnesses.

JOHN VANES.

Witnesses:

O. E. WILDER, W. T. SMITH. 

